 /*******************************************************************************
  * Copyright (c) 2004, 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.ui.internal.progress;

 import java.util.ArrayList ;
 import java.util.Collections ;
 import java.util.List ;

 import org.eclipse.core.runtime.Assert;
 import org.eclipse.core.runtime.IProgressMonitor;
 import org.eclipse.core.runtime.jobs.Job;
 import org.eclipse.ui.PlatformUI;

 /**
  * The ProgressAnimationProcessor is the processor for the animation using the
  * system progress.
  */
 class ProgressAnimationProcessor implements IAnimationProcessor {

     AnimationManager manager;

     /**
      * Create a new instance of the receiver and listen to the animation
      * manager.
      *
      * @param animationManager
      */
     ProgressAnimationProcessor(AnimationManager animationManager) {
         manager = animationManager;
     }

     List items = Collections.synchronizedList(new ArrayList ());

     /*
      * (non-Javadoc)
      *
      * @see org.eclipse.ui.internal.progress.IAnimationProcessor#startAnimation(org.eclipse.core.runtime.IProgressMonitor)
      */
     public void startAnimationLoop(IProgressMonitor monitor) {

         // Create an off-screen image to draw on, and a GC to draw with.
 // Both are disposed after the animation.
 if (items.size() == 0) {
             return;
         }
         if (!PlatformUI.isWorkbenchRunning()) {
             return;
         }

         while (manager.isAnimated() && !monitor.isCanceled()) {
             //Do nothing while animation is happening
 }

         ProgressAnimationItem[] animationItems = getAnimationItems();
         for (int i = 0; i < animationItems.length; i++) {
             animationItems[i].animationDone();
         }

     }

     /*
      * (non-Javadoc)
      *
      * @see org.eclipse.ui.internal.progress.IAnimationProcessor#addItem(org.eclipse.ui.internal.progress.AnimationItem)
      */
     public void addItem(AnimationItem item) {
         Assert.isTrue(item instanceof ProgressAnimationItem);
         items.add(item);
     }

     /*
      * (non-Javadoc)
      *
      * @see org.eclipse.ui.internal.progress.IAnimationProcessor#removeItem(org.eclipse.ui.internal.progress.AnimationItem)
      */
     public void removeItem(AnimationItem item) {
         Assert.isTrue(item instanceof ProgressAnimationItem);
         items.remove(item);
     }

     /*
      * (non-Javadoc)
      *
      * @see org.eclipse.ui.internal.progress.IAnimationProcessor#hasItems()
      */
     public boolean hasItems() {
         return items.size() > 0;
     }

     /*
      * (non-Javadoc)
      *
      * @see org.eclipse.ui.internal.progress.IAnimationProcessor#itemsInactiveRedraw()
      */
     public void itemsInactiveRedraw() {
         //Nothing to do here as SWT handles redraw

     }

     /*
      * (non-Javadoc)
      *
      * @see org.eclipse.ui.internal.progress.IAnimationProcessor#animationStarted(org.eclipse.core.runtime.IProgressMonitor)
      */
     public void animationStarted() {
         AnimationItem[] animationItems = getAnimationItems();
         for (int i = 0; i < animationItems.length; i++) {
             animationItems[i].animationStart();
         }

     }

     /*
      * (non-Javadoc)
      *
      * @see org.eclipse.ui.internal.progress.IAnimationProcessor#getPreferredWidth()
      */
     public int getPreferredWidth() {
         return 30;
     }

     /**
      * Get the animation items currently registered for the receiver.
      *
      * @return ProgressAnimationItem[]
      */
     private ProgressAnimationItem[] getAnimationItems() {
         ProgressAnimationItem[] animationItems = new ProgressAnimationItem[items
                 .size()];
         items.toArray(animationItems);
         return animationItems;
     }

     /* (non-Javadoc)
      * @see org.eclipse.ui.internal.progress.IAnimationProcessor#animationFinished()
      */
     public void animationFinished() {
         AnimationItem[] animationItems = getAnimationItems();
         for (int i = 0; i < animationItems.length; i++) {
             animationItems[i].animationDone();
         }

     }

     /* (non-Javadoc)
      * @see org.eclipse.ui.internal.progress.IAnimationProcessor#isProcessorJob(org.eclipse.core.runtime.jobs.Job)
      */
     public boolean isProcessorJob(Job job) {
         // We have no jobs
 return false;
     }

 }

